400521120 has 96 divisors (see below), whose sum is σ = 1282417920. Its totient is φ = 105047040.

The previous prime is 400521113. The next prime is 400521137. The reversal of 400521120 is 21125004.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 400521120.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22441 + ... + 36119.

It is an arithmetic number, because the mean of its divisors is an integer number (13358520).

Almost surely, 2^400521120 is an apocalyptic number.

400521120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400521120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641208960).

400521120 is an abundant number, since it is smaller than the sum of its proper divisors (881896800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400521120 is a wasteful number, since it uses less digits than its factorization.

400521120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13758 (or 13750 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 400521120 is about 20013.0237595422. The cubic root of 400521120 is about 737.1261312918.

Adding to 400521120 its reverse (21125004), we get a palindrome (421646124).

The spelling of 400521120 in words is "four hundred million, five hundred twenty-one thousand, one hundred twenty".